F22 Block

I have a 92 F22 engine with a few head bolt threads stipped out, in the block. Has anyone repaired these before? I figured I could use a helicoil. Is this a common thing for these engines?

not a normal thing but i notice it on a lot of high milage f22's. maybe a machine shop might be able to re-thread the holes for you. wish the same thing happened to my block, instead TWO of the head studs broke off in the block.